Ferber B I, Sharp F A, Freedman R W
Am Ind Hyg Assoc J. 1976 Jan;37(1):32-6. doi: 10.1080/0002889768507404.
A simple, lightweight, prototype dosimeter, based on wet chemical principles, has been developed for personal monitoring of NO2. A simple modification provides for the determination of NOx. This device requires no auxiliary equipment and is intrinsically safe for use in coal mines. In use, NO2 permeates a membrane and is absorbed in acidic aqueous solution containing hydrogen peroxide. The latter oxidizes NO2 to nitrate. When a total NOx determination is required, an oxidizing prefilter converts NO to NO2 prior to conversion to nitrate in solution. The NO3--is determined in the laboratory with a specific ion electrode. The NO2 or NOx is determined from the NO3--found with reasonably good precision and accuracy. Caution should be exercised when using a dosimeter to determine compounds having a "C" value. These devices will not indicate an excursion concentration existing during a limited time. Effects due to dosimeter orientation, liquid evaporation, and temperature (above 15 degrees) were insignificant. Prior to field testing, it would be desirable to conduct more extensive laboratory tests. The entire TLV range of NO (up to 25 ppm) should be covered, and exposure of the dosimeters to known mixtures of NO and NO2 should be evaluated. Tests against specific interferences should also be performed.
一种基于湿化学原理的简单、轻便的原型剂量计已被开发用于个人监测二氧化氮。通过简单的修改可用于测定氮氧化物。该设备无需辅助设备，在煤矿中使用本质安全。使用时，二氧化氮透过膜并被含有过氧化氢的酸性水溶液吸收。后者将二氧化氮氧化为硝酸盐。当需要测定总氮氧化物时，在溶液中转化为硝酸盐之前，氧化预过滤器将一氧化氮转化为二氧化氮。在实验室中用特定离子电极测定硝酸根离子。根据测定出的硝酸根离子，以相当高的精密度和准确度测定二氧化氮或氮氧化物。使用剂量计测定具有“C”值的化合物时应谨慎。这些设备不会显示有限时间内存在的偏移浓度。剂量计方向、液体蒸发和温度（高于15摄氏度）的影响不显著。在进行现场测试之前，最好进行更广泛的实验室测试。应涵盖一氧化氮的整个阈限值范围（高达25 ppm），并评估剂量计对已知一氧化氮和二氧化氮混合物的暴露情况。还应针对特定干扰进行测试。
